<html>
    <body>
    <script>
        function launch() {
            var target = document.getElementById("target");
            var sneak = document.getElementById("sneakattack");
            var proto = document.createElement("div");
            if (sneak.checked) {
                proto.innerText = "Comrades, have a nice day!";
            } else {
                proto.innerText = "Missiles launched against " + target.value;
            }
            document.getElementById("protocol").appendChild(proto);
        }
    </script>
        <form id="control">
            <input type="text" id="target">
            <input type="checkbox" id="sneakattack">
            <button type="button" onClick="launch()">Launch the missiles!</button>
        </form>
        <div id="protocol"></div>
    </body>
</html>
